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Rescue effects in radiobiology: Unirradiated bystander cells assist irradiated cells through intercellular signal feedback.
MedLine Citation:
PMID:  21073884     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Mammalian cells respond to ionization radiation by sending out extracellular signals to affect non-irradiated neighboring cells, which is referred to as radiation induced bystander effect. In the present paper, we described a phenomenon entitled the "rescue effects", where the bystander cells rescued the irradiated cells through intercellular signal feedback. The effect was observed in both human primary fibroblast (NHLF) and cancer cells (HeLa) using two-cell co-culture systems. After co-culturing irradiated cells with unirradiated bystander cells for 24h, the numbers of 53BP1 foci, corresponding to the number of DNA double-strand breaks in the irradiated cells were less than those in the irradiated cells that were not co-cultured with the bystander cells (0.78±0.04foci/cell vs. 0.90±0.04foci/cell) at a statistically significant level. Similarly, both micronucleus formation and extent of apoptosis in the irradiated cells were different at statistically significant levels if they were co-cultured with the bystander cells. Furthermore, it was found that unirradiated normal cells would also reduce the micronucleus formation in irradiated cancer cells. These results suggested that the rescue effects could participate in repairing the radiation-induced DNA damages through a media-mediated signaling feedback, thereby mitigating the cytotoxicity and genotoxicity of ionizing radiation.
Authors:
S Chen; Y Zhao; W Han; S K Chiu; L Zhu; L Wu; K N Yu
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Publication Detail:
Type:  Journal Article     Date:  2010-11-10
Journal Detail:
Title:  Mutation research     Volume:  706     ISSN:  0027-5107     ISO Abbreviation:  Mutat. Res.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-12-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0400763     Medline TA:  Mutat Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  59-64     Citation Subset:  IM    
Copyright Information:
Copyright © 2010 Elsevier B.V. All rights reserved.
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong; Key Laboratory of Ion Beam Bioengineering, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
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